There’s various gadgets available you can use to prevent the computer from forgetting its stored parameters and readiness monitors when the battery is disconnected. Google “memory saver”. When you are ready to remove the battery, make sure everything is turned off, keys in your pocket, doors closed so no inside lights are on. Wait for 15 minutes for the computers to all shut down. Disconnect the negative battery terminal first. Then the positive. When re-installing the battery, again make sure everything is turned off, doors closed, then connect the + terminal first, and the negative terminal last.